Power-transmission mechanism.



PATENTED JUNE 23,'1908. T. SANDBRA. v

POWER TRANSMISSION MIiClANISM.l APPLICATION FILED DEo.19.19o7.

2 SHEETS-SHEET 2.

'rnnononn sANnEnYA, `or CANTON, on-Io'.

' POWER-TRANSMISSION `MIEIGBAN' ISM.

i Specification oi Letters Patent. 'I

' Patented; June es, 190s.

Application mee recenter 19, 1,9m@ serial no. '407,1Q6.

To all whom it-mcy concern:

l Be 't known that l, THEQDORE Snnnnna,

a citizen of the United States, residing at" Canton, in the county of Stark and State of Ohio, have inventeda new and useful ,Improvement in Power Transmission Mechanism, of which the followingis, a-speciiic'ation.

The invention relates to. a mechanismfor transmittin power as from a belt by means of a free ro er; and the objects 0f the im.

provement include the utilization of thel weight and momentum of the roller to su lplement and steady the power transmltted through the belt, and also the utilization of the free roller as' an automatic belt tightener. These objects and other advantages are'attained by the construction, mech-v anlsm and arrangement illustrated the accompanying drarvingain fwhchn-A F1 ure 1 is a verticalfaxial section of the simp e form of the mechanism, showing the -free roller partly in side elevation; Fig. 2,\a` cross section of the same on line 2-'2, Fi .g 1, with a belt'on the roller; Fig. 3, avertica -l axial section of a geared form vof the mech, anism, showing the free roller partly in side elevation; and Fig. 4, a cross section of the same on line 4-4,'Fig. '3, with a belt and` rdrivin pulley geared to'theroller.y Sim ar numerals refer to similar parts throughout the drawings.

The most sim le form of Whichthe free roller 1 is provided wit lain axles or trunnio s 2 on each side. The riven wheels 3 are secured qu co-axial shafts 4 on each side of the free ;rol1er and these Wheels are provided with the peri heral cylinfclric an es 5, on 'tlie inner si es of which flanges t e trunnions of the Iroller are su ported and adapted If'to operat'e. The sha ts m turn are journaled in suitable bearings,

was.

When the belt 7 is o erated by a driving pulley, not shown on S eet 1, the free roller 1s rotated, preferably inthe direction shown by the arrows;rv The'rolling ofthe trunnions on the peripheral flanges of the driven wheels causes the same t'o rotate, thus communicating the power to the shaft 4, from which it is transmitted by suitable gearing in the usual manner. The Weightof the `free roller which is entirely supported on the eri heral flanges, serves to increase the frictlona contact of the trunnions on the anges, so thata the invention is illustrated in S eet 1 of the drawing?, 1n the considerable amount of power can lbe trans-r in itted by this simple form of the mechanism.

formed .by them, will cause the free roller` to move forward to 4a position asf indicated by broken lines Fig. 2. This forward. Inove-` 4 f ment of the free 4roller Will Ilot only serve t0 automatically tighten the belt,but as the 65 roller trunnions travel upward on` the flan es,

of the .driven "Wheels,- the weight of the ro er will serve to accelerate themotion ofthe wheels. And conversely, if for any reason the initial ower should be lessened, the mo. 70 mentum o'A the driven machinery will-carry the roller backward to a position-as indicated by dotted lines in Fig. 2, and the tension of the belt will be lessened and the `/vveight of the roller will serve to retard the movement of 75 the' driven wheels. v The free roller thus not only acts as an automatic belt tightener but servesto steady the motion ofthe driven nia-A chinery. The trlavel of the plain trunnions onthe peripheral-flanges-is practically noise-` 80 less, so that this form ofthe mechanism runs very quietly.

A form of the invention in which a coggearin is employed to make positive the ac- Y tion o lthefree pulley on the driven Wheels is -illus'trat'ed in Sheet 2 of the drawings. The free\pull ey 1a is provided with the axial trunnionsajn the form of cog-pinions, and the driven\ Wheels 3EL have the peripheralflanges 5*l 'in the form of internal-annular 90 cog-gears, 'in which gears the cfoginions are adapted 'to mesh, and o erate. n Sheet -2 the -driven'wheels are s own as secured on the through shaft 4,, which is journaled in the bearings 6, and from which power is 95 taken as by the ordinary ulleyy 8% In this form ofthe mechanism, t e di meter of the free roller is limited to approximately one half of the diameter of t e driven wheels,

because olthe presence of the through shaft 100l between t e driven wheels. The free roller 1a is driven, as before, by the belt 7*l from a driving ulley as 9, and the operation of the mechanism is substantially the same asl described for the simple form, excepting that 105y there can be no sli ping' of the trunmons, 1n'

this case the co -plnions ofthe free roller, on

edges will not interfere with the driven wheels; but it will be understood that under the Well known'law o'f rotating bodies, there will be no tendency 'for the axis of -thefree roller to shift from its position of parallelism with reference to the axis of the driven wheels. l

By supporting the driven roller at the periphery of the driven Wheels, free of any journal Hearings, fulladvantage is taken of Athe weight an of all the= peculiar laws which .govern a freely 'momentum of the roller and rotating cylinder and'for the purpose of increasin the weight of the free pulley it is prefere.' l 'made substantially in the form of a sohd gcy der, which same can be lightened` by cavities as may be desired.

W'hat I claim as `my invention and desire to secure by Letters Patent, is-;

1. A mechanism 'for transmitting power comprising a pair of wheels h' vin annular flanges yand belng co-axiallyd/urna ed'opposite each other, and a free ro er having axial trun'nions on its ends adapted to be supported entirely on thelanges and to roll freely thereon. v-I

2. A mechanism for transmitting power` vcomprising a pair of wheelshavin annular flanges and being co-axially; 'ourna ed opposite each other, and a free ro' er having axial trunnions on its ends adapted to be sup ortl ed entirely on the flanges and tofrotate eely thereon, with means for operating the roller. .3 3. A mechanism for transmitting power cbmprising a pairof wheels having annular anges and being co-axially '-ournaled opposite each other, and a 'free ro ler having axial trunnions on itsends adapted to be supported entirely on the flanges and to rotate freely thereon, with an adjacent driving pulley and a belt on the roller and plilley.

4. A. mechanism for transmittin power `com rising a pair of wheels co-axia y journale opposite each other and having internal-annu ar cogears thereon, and avree' ,roller having aXla cog-trunnions -on its ends adapted to be supported entirely on the cog- .gears and adapted to roll freely thereon roller having axla cog-triinnions on its ends adapted .to be supportedentirely on the coggears and adapted to roll freely thereon, with an adjacent driving. pulley and a belton the roller and pulley. `r

i 4' IHEODORE SANDERA Witnesses: I i

ETHEL SARDERA, i MARY CAVANAUGH. 

